// 
// MemberAccessorCacher.cs
//  
// Author: Daniele Giardini
// 
// Copyright (c) 2012 Daniele Giardini - Holoville - http://www.holoville.com
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Reflection;

namespace FastDynamicMemberAccessor
{
	/// <summary>
	/// Cache manager for James Nies' MemberAccessor classes
	/// </summary>
	static internal class MemberAccessorCacher
	{
		// VARS ///////////////////////////////////////////////////
	
		static	private		Dictionary<Type,Dictionary<string,MemberAccessor>>		dcMemberAccessors;
		
		
		// ===================================================================================
		// METHODS ---------------------------------------------------------------------------
		
		/// <summary>
		/// Returns the cached memberAccessor if it alread exists,
		/// or calls MemberAccessor.Make and caches and returns the newly created MemberAccessor.
		/// </summary>
		static internal MemberAccessor Make( Type p_targetType, string p_propName, PropertyInfo p_propertyInfo, FieldInfo p_fieldInfo )
		{
			if ( dcMemberAccessors != null && dcMemberAccessors.ContainsKey( p_targetType ) && dcMemberAccessors[p_targetType].ContainsKey( p_propName ) )
				return dcMemberAccessors[p_targetType][p_propName];
			
			if ( dcMemberAccessors == null )							dcMemberAccessors = new Dictionary<Type, Dictionary<string,MemberAccessor>>();
			if ( !dcMemberAccessors.ContainsKey( p_targetType ) )		dcMemberAccessors.Add( p_targetType, new Dictionary<string, MemberAccessor>() );
			Dictionary<string,MemberAccessor> dcFinal = dcMemberAccessors[p_targetType];
			
			MemberAccessor ma = MemberAccessor.Make( p_propertyInfo, p_fieldInfo );
			dcFinal.Add( p_propName, ma );
			
			return ma;
		}
		
		/// <summary>
		/// Clears the cache.
		/// </summary>
		static internal void Clear()
		{
			dcMemberAccessors = null;
		}
	}
}

